function jsonAjaxRequest(url, requestData, callback) {
	$.ajax({
        type: "POST",
        url: url,
        data: requestData,
        success: function(data, textStatus, xhr) {
        	callback(data) ;
        }
	});
}

function htmlAjaxRequest(url, callback) {
	$.ajax({
        type: "POST",
        url: url,
        dataType: "html",
        success: function(data, textStatus, xhr) {
        	callback(data) ;
        }
	});
}

